Ch4 Hose Appliances and Hose Tools Flashcards
(31 cards)
What are means of directing and controlling the water flow into the hose?
Valves
What are the six types of valves?
gate, ball, butterfly, floating, piston, and clapper
What are the two types of gate valves?
rising stem and nonrising stem
Blank valves are relatively heavy and bulky but are well suited for use on a hydrant or pump discharge orifice
Gate
The blank valve is the most commonly used valve in the fire service
Ball
The blank valve has a disk that pivots within the waterway
Butterfly
What is the butterfly valve most commonly used on?
4.5 inch and larger intakes and in private water supply systems
A blank valve is a new valve design that allows the connection of a water supply to the pumping apparatus while the pump is operating and under pressure
floating
A blank valve is a hinged valved that allows water to flow in one direction only
clapper
A blank valve has an internal piston that moves withing a cylinder to control the flow of water through the valve
piston
What does a four-way hydrant valve allow the first arriving attack pumper to do?
connect the valve ot the hydrant, connect a supply line, proceed to the emergency scene, and charge the supply line from the hydrant
An automatic hydrant valve eliminates the need for?
to leave a person at the hydrant when making the hydrant connection
A blank automatic hydrant valve automatically opens after a preset period of time
mechanically delayed
When is a manifold valve particularly useful?
in situations where pumping apparatus have limited access to buildings
what is a wye appliance
a device that comebines one supply line into two attack lines, consists of a female intake with two male fittings on the discharge side
what does a siamese device consist of?
a siamese has two female couplings on the intake side and one male fitting on the discharge side
when is a siamse deice used?
it is used when friction loss in a supply hose needs to be reduced
Placing blank along a hose length enables a pumping apparatus to connect to the valve ato boost pressure in the hoseline?
inline relay valve
An external intake relief valve has a spring-loaded internal component that diverts any sudden pressure surge away from the?
fire pump
Defn of fittings?
devices that facilitate the connectoin of hoselines of different sizes to provide a continuous, uninterupted supply of water from a source to the nozzle
What is an adapter?
is a fitting for connecting hose coup;ings with dissimilar threads or coupling types but with the same inside diameters
What is an elbow?
a hose fitting that provides support for an intake or dishcarge hose at the pumping apparatus
what is the common size of a hydrant wrench?
16-18 in
what are spanners primarily used for?
tighten and loosen hose couplings
